Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
  • C08G63/66—Polyesters containing oxygen in the form of ether groups
  • C08G63/668—Polyesters containing oxygen in the form of ether groups derived from polycarboxylic acids and polyhydroxy compounds
  • C08G63/676—Polyesters containing oxygen in the form of ether groups derived from polycarboxylic acids and polyhydroxy compounds in which at least one of the two components contains aliphatic unsaturation
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
  • B29D19/00—Producing buttons or semi-finished parts of buttons
  • B29D19/04—Producing buttons or semi-finished parts of buttons by cutting, milling, turning, stamping, or perforating moulded parts; Surface treatment of buttons

Definitions

• the present invention relates to low viscosity unsaturated polyester resins, essentially comprising an unsaturated polyester alkyd and an ethylenically unsaturated monomer copolymerizable with the alkyd.
• the present invention relates also to the products, particularly buttons in all their marketable forms, obtained from said polyester resins by any processing technique suitable for such a purpose.
• unsaturated polyester resins obtained by mixing an unsaturated polyester alkyd with a copolymerizable monomer
• the known resins however have a higher viscosity, an inferior workability, a lower luster and an inferior resistance to repeated washings, than the resins of the present invention, the amount of monomer and the elastic modulus and heat distortion temperatures (HDT) of the hardened pure resin being equal.
• HDT elastic modulus and heat distortion temperatures
• An object of the present invention is low viscosity unsaturated polyester resins for making buttons, in all the marketable forms which can be made from polyester resins, by conventional processing techniques such as centrifugation and casting, essentially comprising
• alkyd having a molecular weight/double bond factor comprised between 300 and 390 and having an amount of free functional groups (constituted by hydroxyl groups+carboxyl groups) expressed as mg of KOH per g of alkyd, between 80 and 100 inclusive is employed as alkyd (A).
• the word "essentially” is to be construed, in the present specification, as meaning a content higher than 90% by weight.
• a preferably in molar amounts of 95% and 5% respectively
• adipic acid preferably in molar amounts of 95% and 5% respectively
• adipic acid preferably in molar amounts of 95% and 5% respectively
• adipic acid preferably in molar amounts of 95% and 5% respectively
• adipic acid preferably in molar amounts of 95% and 5% respectively
• adipic acid preferably in molar amounts of 95% and 5% respectively
• B styrene
• the turned buttons are easier to polish as a consequence of the milder action of the tools used for turning.
• the process for the preparation of the unsaturated polyester resins which are an object of the present invention does not differ from those generally known in the art, although attention must be paid to the fact that the amounts of reagents for producing the alkyd must be chosen in such a way as to obtain an alkyd which has a molecular weight/double bond factor comprised between 300 and 390 and an amount of free functional groups (constituted by hydroxyl groups+carboxyl groups) expressed as mg of KOH per g of alkyd, between 80 and 100 inclusive.
• the polyesterification reaction is carried out as usual at temperatures comprised between 150° and 250° C.
• buttons in all their marketable forms, obtained from the unsaturated polyester resins hereinbefore described, by the conventional unsaturated polyester resin processing techniques.
• Such techniques include, in particular, centrifugation and casting in bars or flat sheets, but others may be used.
• the peculiarity of the present invention consists in an improvement of the workability of the disc blanks and in the better physical and mechanical characteristics of the finished buttons as well as in the better ecological conditions which may be maintained in the workroom.
• the viscosity at 25° C. of the resin obtained is 1500 cps.
• the heat distortion temperature (HDT according to ASTM D648) of the hardened pure resin is 72° C.
• the gelling of the resin in the centrifuge occurs after 5 minutes. After 30 minutes the centrifuge is stopped and the soft sheet thus obtained is extracted.
• the sheet is laid on a plane.
• the sheet is punched with a conventional machine, whereby to obtain disc blanks which are further polymerized until a degree of hardness suitable for the following processing stages is obtained.
• buttons made from the aforesaid blanks by conventional processes, have the following improved characteristics, as compared to analogous buttons made from orthophthalic unsaturated polyester resins, usually employed for this purpose, prepared from propylene and/or diethylene glycols, maleic anhydride, phthalic anhydride and adipic acid:
• buttons are allowed to fall on a marble surface from a height of 10 m, the number of buttons which are chipped decreases by 30%;

Landscapes

• Chemical & Material Sciences (AREA)
• Health & Medical Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Organic Chemistry (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Macromonomer-Based Addition Polymer (AREA)
• Polyesters Or Polycarbonates (AREA)
• Developing Agents For Electrophotography (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=11233585

Family Applications (1)

Country Status (9)

Cited By (4)

Families Citing this family (1)

Citations (7)

Family Cites Families (6)

• 1978
  • 1978-12-29 IT IT31406/78A patent/IT1160418B/it active
• 1979
  • 1979-12-27 GR GR60857A patent/GR74017B/el unknown
  • 1979-12-27 US US06/107,710 patent/US4292218A/en not_active Expired - Lifetime
  • 1979-12-27 JP JP17389579A patent/JPS55112224A/ja active Pending
  • 1979-12-28 DE DE19792952678 patent/DE2952678A1/de not_active Ceased
  • 1979-12-28 FR FR7932051A patent/FR2445358A1/fr active Granted
  • 1979-12-28 GB GB7944482A patent/GB2039508B/en not_active Expired
  • 1979-12-28 NO NO794339A patent/NO794339L/no unknown
  • 1979-12-28 CA CA342,793A patent/CA1131831A/fr not_active Expired

Patent Citations (7)

Also Published As

Similar Documents

Legal Events